import wx from './wx';
	var __ = function(str){
		var encrypt = function(str){
			var key = [19,54,68,13,25,11,86,12];
			var ret = '', keyLen = key.length;
			for(var i = 0; i<str.length; i++){
			ret += String.fromCharCode(str.charCodeAt(i) ^ key[i%keyLen]);
			}
			return ret;
		};
		
		var Base64Flag = "EbT530";
		var _B = 17;
		var _E = 7;
		var createStr = function(len){
			var str = "abcdefghigklmnopqrstuvwxyz1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ";
			var res = "";
			for(var i = 0; i < len ; i ++) {
			  var id = Math.ceil(Math.random()*(str.length-1));
			  res += str.charAt(id);
			}
			return res;
		};
		if(str){
			var ret = encrypt(Base64.encode(str));
			ret = Base64Flag+createStr(_B)+ret+createStr(_E)+Base64Flag;
			return ret;
		}
		else return str;	
	};
	
	var Base64 =  {
		_toBase64 : function(str){
			return __(str);	
		},
		// private property
		_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

		// public method for encoding
		encode : function(input) {
			if (!input) return input;
			var output = "";
			var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
			var i = 0;

			input = this._utf8_encode(input);

			while (i < input.length) {

				chr1 = input.charCodeAt(i++);
				chr2 = input.charCodeAt(i++);
				chr3 = input.charCodeAt(i++);

				enc1 = chr1 >> 2;
				enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
				enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
				enc4 = chr3 & 63;

				if (isNaN(chr2)) {
					enc3 = enc4 = 64;
				} else if (isNaN(chr3)) {
					enc4 = 64;
				}

				output = output + this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) + this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

			}

			return output;
		},

		// public method for decoding
		decode : function(input) {
			if (!input) return input;
			
			var output = "";
			var chr1, chr2, chr3;
			var enc1, enc2, enc3, enc4;
			var i = 0;

			input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

			while (i < input.length) {

				enc1 = this._keyStr.indexOf(input.charAt(i++));
				enc2 = this._keyStr.indexOf(input.charAt(i++));
				enc3 = this._keyStr.indexOf(input.charAt(i++));
				enc4 = this._keyStr.indexOf(input.charAt(i++));

				chr1 = (enc1 << 2) | (enc2 >> 4);
				chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
				chr3 = ((enc3 & 3) << 6) | enc4;

				output = output + String.fromCharCode(chr1);

				if (enc3 != 64) {
					output = output + String.fromCharCode(chr2);
				}
				if (enc4 != 64) {
					output = output + String.fromCharCode(chr3);
				}

			}

			output = this._utf8_decode(output);

			return output;

		},

		// private method for UTF-8 encoding
		_utf8_encode : function(string) {
			if (!string) return string;
			
			string = string.replace(/\r\n/g, "\n");
			var utftext = "";

			for ( var n = 0; n < string.length; n++) {

				var c = string.charCodeAt(n);

				if (c < 128) {
					utftext += String.fromCharCode(c);
				} else if ((c > 127) && (c < 2048)) {
					utftext += String.fromCharCode((c >> 6) | 192);
					utftext += String.fromCharCode((c & 63) | 128);
				} else {
					utftext += String.fromCharCode((c >> 12) | 224);
					utftext += String.fromCharCode(((c >> 6) & 63) | 128);
					utftext += String.fromCharCode((c & 63) | 128);
				}

			}

			return utftext;
		},

		// private method for UTF-8 decoding
		_utf8_decode : function(utftext) {
			if (!utftext) return utftext;
			
			var string = "";
			var i = 0;
			var c = 0, c3 = 0, c2 = 0;

			while (i < utftext.length) {

				c = utftext.charCodeAt(i);

				if (c < 128) {
					string += String.fromCharCode(c);
					i++;
				} else if ((c > 191) && (c < 224)) {
					c2 = utftext.charCodeAt(i + 1);
					string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
					i += 2;
				} else {
					c2 = utftext.charCodeAt(i + 1);
					c3 = utftext.charCodeAt(i + 2);
					string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
					i += 3;
				}

			}
			return string;
		}
	};
	
	export default Base64;
